Eeeneteresting. For use on firebreathers, I guess?

Or just as a Mind Control with bonus.

Wait, would the ability check power upon resolution? That would be awesome with firebreathing.

Well, deterring someone from pumping a creature is the only reason I can see to split the taking control like that.

Also funny: Hydrosurge.

Me: I play Dalek Puppet. During your next attack step, I take your dragon. Take 5.
Opponent: Okay, wise guy. I take my dragon back.
Me: Hydrosurge. I take no damage. Next turn, I take your dragon. Take 5.

How are they taking their dragon back?

Aw, crud. I read the card wrong. I was assuming that last ability had "Any player may activate this ability". I have no idea why... I guess my mind thought it sounded more fun, so that's what I saw.

I thought it was probably meant to have "Any player may activate this ability" at first.

This might read more clearly as:

> Enchant creature
> : Gain control of enchanted creature. It deals damage equal to its power to its previous controller.

(Because why are you going to use any other means of gaining control of it?!)

More interestingly again, make this have mana cost and the activated ability cost , or similar.

If the abilities are linked, then you can pay as many times as you want and deal damage that many times. The current wording prevents that shenigan. I do like your costing, however. Unfortunately, it weakens all of the fun combos with Zedruu, Bazaar Trader, etc.